<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box{
        width: 210px;
        border: 1px #666666 solid;
        margin: 10px auto;
    }
    .clearfix::after,.clearfix::before{
        content: '';
        display: table;
    }
    .clearfix::after{
        clear: both;
    }
    .clearfix{
        zoom:1;
    }
    .box>div{
        float: left;
        width: 50px;
        height: 50px;
        margin: 10px;
        background: gold;
    }
</style>
<body>
    <div class="box clearfix">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
    </div>
</body>
</html>